Tiltable door structure



July i5, i952 J. WIELAND 2,662,969

TILTABLE DooR STRUCTURE FiledApril 18, 195o [jig- 5' I 1N VEN TOR:

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Patented July 15, 1952 TILTABLE DOOR STRUCTURE JacobWieland, Gorinchem,Netherlands, assigner i to De Vries Robb & Co. N. V.

' Application April 18, 1950, Serial No. 156,543

VVI nkthe Netherlands March 28, 1949 The invention relates to a tiltabledoor structure of thetype wherein a door is suspended on one or morehinged arms, so that when opening or closing the door the lower sidethereof moves in the plane, in which the door opening is arranged or ina plane parallel thereto, and the lower side of the door being guided.

The invention is applicable `not only for doors vbut also for suspendedwindows or panels.

i With door and window construction of said type a hinged arm is atoneendconnectedjwith the wall, in which there, is arranged the openingto be closed by the said door or window.

The problem underlying the invention, as well as lthe solutions andapplicationjresulting'from same; are illustrated. in the accompanyingdrawing and more.preciselydescrbed underneath.

Fig. 1 is a schematic view, partly in section that shows an almostcompletely opened door with the wall, to which the door is iixed, withtriangle of forces belonging to it.

Fig. 2 is a schematic view, partly in section, similar to Fig. l, butshows a corresponding schematic performance with the door in an almostclosed position, also with a triangle of forces belonging to it.

Fig. 3 and Fig. 4 are schematic views that show the ratio between thelengths of the hinged arm and the distance of the guide of the lowerside of the door up to the fastening point of the hinged arm.

Fig. 5 is a schematic elevational view that shows a way of attachment ofthe spring to the door and the fixed wall.

The door I has at the lower side guiding rollers 2, which when openingand closing the door roll along the guides 3 in the plane of the wall 4.The door l is fixed by means of the hinged arm 5. Said hinged arm is xedto the wall at 6 and to the door at l. The length of the hinged armbetween the two pivoting points is indicated at C, whereas the distancebetween the roller shaft and the pivoting point 'l is indicated at D.According to the invention C is larger than D.

From the triangles of forces belonging to Figs. 1-4, it can be observedthat in the highest position of the lower side of the door the verticalcomponent of the compressive force working in the door plane is as smallas possible and, conversely, that force is as large as possible whensaid lower side is situated as far as possible from the point 6. If thelegs 6, 'l and 2, 'l of the trangle 6, l, 2 were equal, the verticalprojections of the stressing force and the Vertical projection of thecompressive force would be equal.

2 claims. (c1. .2cK-i6),`

By the construction accordingto the invention the vertical projection ofI,the` compressive force becomes larger as the doorapproachesthe closedposition (seeFg. 2 triangle of' forces) 1 On the lowerjside of thedoorthere' always applies a force G and the vertical-component of thecompressive force If the door is brought from `the closedinto the openposition, inthe beginning, the largest force must. be exerted upwardsinvertical direction on the lower s ide 'of the door. i

If, for instance. a tension spring is fixed at one end to Vthe lowerside o f the door (such as one of the springs schematically indicated at8 and l I of Fig. 5), and the other spring end is attached to a xedpoint in such a way that for closing the door the spring is stretched,the spring will be stretched more when the door is closed as thedistance between the points 6 and 2 becomes larger. Therefore when thedoor is opened, that spring has in the beginning the largest influence,which decreases when the vertical component of the compressive forcebecomes smaller.

According to an embodiment of the invention, there is provided aso-called pre-stretched tension spring. Such a spring is especiallysuited for acting in very different positions of the door. The tensionof the spring is largest in the completely closed position of the doorand is decreased when the door is opened.

With the help of the triangular diagrams of Figs. 3 and 4 the length ofthe hinged ar-m in proportion to the distance of the fastening point ofthe hinged arm up to the guide at the lower side of the door can becalculated.

In Fig. 3 the door hangs horizontally in the extremely opened position.

a=the distance of the guide of the lower side of the door in completelyclosed position up to the fastening point of the hinged arm c b=thisdistance, when the door is completely from which follows that c=a-d.

3 When the angle of inclination of the door is cos A Whereas in theschematical drawing only one hinged arm is indicated, in practice ahinged arm will generally be arranged at both sides of the door.

As appears from Fig. 5 the springs, especially the pre-stretchedsprings, can lie in the same or nearly the same plane as the dooropening. In this case tension springs 8 and Il are attached at the lowerside of the `door at both sides of the door, whereas the other ends ofsaid springs are attached to the wall of the door opening at points 9and I0 diagonally. opposite to the fastening points 2 oi' the springs tothe door.

In the embodiment as illustrated two prestretched springs 8 and H arexed in the described Way, so that the spring 8 is fixed to the point 2of the door and the point 9 of the wall, whereas the draw spring Ii isxed at the other side of the door and to the point l of the wall.

I claim:

1. In an overhead door structure including an apertured frame having astraight guide, a door movable relative to said frame between anaperture closing position and an opening position at right angle to theformer and having an end sin 4 edge engaging said guide describing asubstantially linear path. pvot means mounted directly on said doorwithin the connes thereof spaced from said end edge for a predetermineddistance, and unitary rigid link means pivoted to said pivot means andto said frame, said link means having a length greater'than saidpredetermined distance, said predetermined distance being the sum of thelength of said link means and the distance between said edge in closedposition and the pivot point of said frame.

2. Inv an overhead structure, as lclaimed in claim 1. in combinationwith, tension spring means secured to said frame and connected to saidone end edge and being operable, in con- JACOB WIELAND.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS Number Name Date 693,952 Cross Feb. 25, 1902875,306 Wilson Dec. 31, 1907 1,757,955 Dautrick May 13, 1930 2,173,684Graham et al Sept. 19, 1939 2,353,263 Pierce July 11, 1944 FOREIGNPATENTS Number Country Date 41,442 Netherlands Aug. 16, 1937 55,413Netherlands Oct. 15, 1943 115,569 Australia July 17, 1942

